import pgzrun


def draw():

    #主要练习全背景填充，重点练习坐标
    # red black yellow green orange blue purple
    screen.fill('green')
    screen.draw.filled_circle((200, 300), 50, 'purple')
    screen.draw.filled_circle((400, 400), 10, 'blue')
    screen.draw.filled_circle((600, 500), 100, 'yellow')

pgzrun.go()
